Electric drill.



W. J; BAUR0TH.

ELECTRIC) DRILL.

APPLICATION FILED APR. 9, 1909.

2 SHEETS-SHEET l.

Patented Nov. 12,1912.v

d. TM/f W. .I. BAUROTH. ELECTRICl DRILL. vAPPLICATION FILED Amm, 1909.

Patented Nov, 12,1912.

629i tucson (Nieuws,

f UNiTED sfrApEsmtArENT OFFICE.

WALTER (T. EAUROTH;A or COLUMBUS, oHIo,-Ass1GNoR To THE JEFFREY MANUFACTUR- ING COMPANY, A CORPORATION F OHIO.

ELECTRIC DRILL.

Specification of Letters Patent.

Application med April 9, 1909. serial No. 488,915.

To /ir/zom it 'muy f1/worn.:

l 3o it known that l, Murau J. BAUROTH,

i a ritixcn ol" the llnited States, residing at (bluinbus, in the` county of Franklin and Stato of Ohio, have invented certain new and This invention relates to improvements in electric rotary coal or rock drills and its object is to provide a drill of this class whichv shall be light and `simple in construction,

, and readily adjustable for drilling at Various elevations and angles.

()t` the dra\vings-l `igure 1 is an endelevation. Fig. 2 is a cross sectional elevation through the center line of the'motor. Fig. 3 is a plan view, a section being taken through the vertical portion of the standard.

Figyt is a cross sect-ion through the centerA of the drill .stem and along the line :v -:c of

l `ig. 2. Fig. .iis an enlarged detail View of the locking device. v Referring to the drawings, A represents the frame or standardas a whole.

1 is the man1 upright andprefeiably comprises aA single I-beam. This has bolted to t its upper .and 'lower ends the two brackets 2 and The bracket 2 at-the upper end carries the supporting point or center. 2*, which is held in place by the set screw 4.

'The bracket-3 at the lower end carries the jack which is held in place by the set screw 6. The jack may be of any `lsual or preferred type. AThat whichv I have snow 1 in "the drawings has the inner threadl standard 7 and the pointed sleeve and hand wheel ,8 adapted to feed support standard 7 Threads on the hand wheel enga-ge with thev threads `on the standard, thus providing means of adjustment. At the lower end of means of these holes the bracketv 3 may be theupright/L provide a series of holes 9, 9 spaced the .saine distance apar't,`as the holes for the bolts 10, 10 of `the bracket 3. By

bolted to the upright 1 at a number of different points, thus changing the over-al1 distance between the two supporting points. In this way l am able to provide a considerable range of adjustment to adapt the drill torooms of .farying heights. If a still wider range of adjustment than can be obtained by this means is desired, several upri hts ofv different lengths can `vbe provide The point 2 and thev jack 5 are interchangeable, and the elevation of the upright l may be changed by transposing them.

I represents as a whole an electric motor which may be ot' any usual or`prcferred type. That. which l have .shown con'iprises the mam frame 11, the field windings 12', the main shaft 13, the armature 14, the commutator 15 and the brushes'l. The frame 1l has a bracket 1T, preferably cast integral 18 is provided to clamp the bracket in posi-.

tion upon the upright and may be tightened by thrusting a barinto the eye. Bv means ofy this bracket and eye-bolt the motor may be securely clamped tothe. upright at any desired elevation. i

19 is a supporting frame rotatably mounted at one end of the-motor frame. The motor frame has bearing surfaces 20, .and the supporting frame is formed to engage with and rotate in thesebearing surfaces. The clip 21 is provided to secure the supporting frame in position. The frame has two journal bearings 22 and 23 for the main motor shaft. Between these lbearings is located the worm 24, keyed or otherwise serurely fastened to the motor shaft. The br ll `thrust bear-mg 25 is located between the worm and the journal bearing 22. In the Patented Nov. 12,191.2.

lwith the frame. This bracket is formed to supporting frame and at right angles to the motor shaft the worm wheel 2G is mounted in suitable bearings so that it will mesh with the worm 24. yThe supporting `frame 19 isdivided into two parts 19a land 19" in order o permit'proper assembling of t-he parts. The threaded drill stem 27 is mounted within the worm wheel'having spline and groove engagement therewith.

28 represents as a' whole the feeding de vicelocated at one end of the supporting frame 19. .This feeding device may be 0f any preferred type, but for purposes of illustration I have shown one similar'to that shown in an application for patent byWQF" Trotter, Ser. No.333,697, filed Septlf( This has an inner split feed nut, wliichi'is held together and in engagement. with the drill stem by means of the two kclamping members 29, 29 and the clamping lscrev'v 305-`r These clamping members 29, 29 are rotatably mounted upon the member 31, and a frictonal band brake 31' is provided to .reet line of thrust. through to turn niay be adniusted byproperly regir.

lating the friction-.il connection between the pai-ts E29, Q9 and 3l.

porting traine in position with relation to the motor frame. '.llic motor clip 21 is provided 4with a boss 34 having a hole into which a plug is secured.

3G is a pin passing through the boss 34 and the plug itsy inner en( with notches 37 in the supporting frame. 'lhe pin 36 is made small at its outer end, and the coiled spring 38 Within the plug 35 acts to 'force the pin inward to engage with the supporting frame.

. 39 is a knob, by means of which the pin may be pulled out to permit the movement of the supporting frame.

By providing a. siilticient number of holes in the supporting frame it. may be locked at ractically any desired position. The drl stem is so mounted in relation to the standard that it will at all times lie in a vertical plane, passing through the upper and lower supporting points. This gives a ditlie drill stem without any tendency t'or bending.

The worm and wheel transmission between the motor and the drill stein permits the use of a high speed, and consequently a small and light electric motor, without a complicated speed producing n'ieehanisin. The rotatable mounting of the drill stein supporting frame with respect to the motor frame permits the drill stem to be`swung to any angle without moving the motor rom its normal horizontal position. Herctofore it has been common in rotary electric drills to use a hollow ar'. atui'e shaft., the drill stem passing through it. With this form of construction, it was necessary toA move the whole motor when it was desired to point the drill at an angle, either upward or downward. This movement of the motor intel# fered materially with its proper lubrication, and also made great changes in the load on the thrust bearings. ln a` drill embodying my invention the drill `stein may be pointed in anyr direction from horizontal to vertically upward or vertically7 downward without in any way changing the position of the motor. The load on the thrust hearing 25 remains constant at all times. If it is desirable to providt` for driving the drill at two, as has been 33 is a loel' ng device to secure the sup- :35 and is adapted-to engage at .versing the position of the .motor shaft and gearing dit'l'erentspeeds, this may be accomplished by the use of worms and worm wheels of different pitches. The. division of the supporting frame 1.9 along a vertical line pei'- mits the part lil to be readily removed for changing the worm and worin wheel.

.lf it. is desired at any time. to obtain access to the armature eonnnutatdi', this may be done by moving the clip il, which leaves the .supporting frame [ree so that it can be. removed, carlving wit-h it tlie motor shaft, the armature and the eonunutator.

The use of a single upright 1. instead of common heretofore. perriiits the more ready adjustment of the bracket 3 alid permits the whole machine to be placed much closer to the wall of a room. When the machine is not close to the wall of the room there is an unobstructed space for the operator to adjust the feeding device.

, If it is desirable to drill at a point higher than may be reached with the parts of the machine in normal position, greater elevation of the machine may be obtained by redrill stem, i. e., by swinging the supporting frame through 180, so that the worm wheel will be located abovel instead of below the worm. It will be readily understood that the various adjustments which I have described will make it possible to drill holes in a wide range of positions in rooms of varying heights.

What I claim is- 1. In an electric rotary drill the combination of a standard rovidod at its ends with pointed parts in su tantially vertical alinement for pivotal engagement with the floor and roof of a mine and with a single offset portion intermediate its ends, an electric motor mounted upon the offset portion of the standard and having the axis of its shaft horizontal, and parallel to but, separated from the plane of the standard, a rotary' drill stem, a drill stein support mounted olely on the motor trame and adapted to oscillate concentrically with the axis of the between the motor shaft and the drill stem, substantially as described.

2. The combination, in an electric drill of a standard having pointed end parts adapted for pivotal engagement with the floor and roof of a mine, an electric motor mounted upon the said standard, a drill stem, a drill stein support mounted solely on `the motor frame and adapted to swing concentrically about the axis of the motor shaft and gearing between the motor shaft and the said drill stein,` substantially as described.

3. The combination in a rotary drill of an electric motor, a device for .supporting the motor, a drill stem, a drill stem support mounted on the motor frame to oscillate eoncentrically about the axis of the motor shaft, the axis of the drill stem and the axis of the inotoishaft being,T at right :ingles to each `otlii' in separlitecl parallel planos, and. gearing between the inoloi' shi'if sind flic drill stein, substantially :is described..

4i The combination in n. r'ol'liry cli-ill of an electric motor, means foi .supporting 'the motor', a drill stom, u drill stom support y mounted solely upon the 'inotoili'z'iineio swing conceiitri'cnlly about the axis of the motor slm-ft', the axis of the' drill stein-and the motor shaft being` at right. angles to each vl*other in separated parallel planes, li worin on the inotorglift. and :i woi'in wheel connected with the drill 5min :ind onguging lli@ .said worin,siibstiintiiilly as desciibiu'l.

The conil'li'nlilion in il rotary diill of ii standard' having pointed 0nd partis in subslantially vertical iilinemont for pivotal cnggeinentwiththe floor and 'roof of :i mine,

@the said'slandard algoliaving un offset p01'- tion between the said points, .an electric Inotor mounted upon tlie offset portion of the` standard and having iis axis horizontal in :i 'pianil parallel l'o but separated fi-oiii the pliine of the s'tiindiiid,iidiill stein and :i ditill stein support rotatably mounted on the Ii1otoi' fi'iiine lo swing concentrically about the :ixis ofthe iiiotoi sliaft,tlie said euppolt being' adapted when in one position to miiintuin the said diill stein in a vertical plane separated fi'oiii tlieplline of the inotoi' shaft :ind on iliv opposite Sido of tlie said plaine. from iliopliine of the said Standziid, and gearing lietwceii the inotoi' Shaft sind the said drill stein, substantially :is described.

(ln testimony Wlwiuofl zi/iix iiiy Sig'nzitiire,' in presence of two witnessos.

lVAL'lER J. BA UllOTlI. lVi'tnesscs F. L. SnssioNs, E. P. SNIVELY. 

